The "hot hands" kind get too hot and don't last long, though they'll work in a pinch. What you really need are the ones used for shipping - they last for 24 hours and don't get hot enough to burn.
Good luck finding a generator now, the time to purchase it was last week, unless you want to drive a good ways inland.
If you only have a few small snakes you can put them into bags and stash them under your clothing to keep them warm. Since I have around 80 + an incubator I have a generator.
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